The unique quick detachable design stops the metal swivel body from contacting the gun. The close machining tolerances provide smooth and silent operation. Super swivels do not include studs. All others include studs or barrel bands.Replaces factory fore-end spacer without altering or dismantling. Does not fit BLR Lightning. Replaces the factory Fore-End Spacer without altering or dismantling. Features: Replaces the factory fore-end spacer without altering or dismantling Mounts on browning BLR rifles (does not fit the BLR lightning)